@Jennifer860 was this an Instant Book?
If so, then your messaging to the guest wasn't really "responding" in the way that "Response Rate" measures.
Response Rate is specifically measuring your timely response to Booking Inquiries and Reservation Requests. Instant Book reservations don't figure into it, because Instant Book reservations do not require a response from the host.
It's not that you are 0 for 1.
You are 0 for 0, meaning you have not had the chance to get up to bat yet. Hence, the 0% batting average.